java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.net.NetworkInfo.isAvailable()' on a null object reference
	at com.entitcs.office_attendance.model_classes.ValidationClass.isInternetAvailable(ValidationClass.java:25)
	at com.entitcs.office_attendance.activities.Drawer_Activity$6.onClick(Drawer_Activity.java:575)
	at android.view.View.performClick(View.java:8160)
	at android.view.View.performClickInternal(View.java:8137)
	at android.view.View.access$3700(View.java:888)
	at android.view.View$PerformClick.run(View.java:30236)
	at android.os.Handler.handleCallback(Handler.java:938)
	at android.os.Handler.dispatchMessage(Handler.java:99)
	at android.os.Looper.loop(Looper.java:246)
	at android.app.ActivityThread.main(ActivityThread.java:8653)
	at java.lang.reflect.Method.invoke(Native Method)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)